Caster



(Model.)

S. T. LAMB.

GASTEB.

UNITED STATES PATENT OFFICE.

SALEM T. LAMB, OF NEW ALBANY, INDIANA.

CASTER.

SPECIFICATION forming part of Letters Patent No. 246,520, dated August 30, 1881.

Application filed July 5, 1881. (Model.)

To all whom t may concern Be it known that I, SALEM T. LAMB, a citizen of the United States, residing at New Albany, Floyd county, Indiana, have invented certain Improvements in FurnitureCasters, ot' which-the following is a specification.

This invention relates to improvements in furniture-casters ofthe class in which a wheel or Wheels are mounted at the extremity of a pivoted frame, so as to rotate freely on their own axes and to revolve around the axis ofthe frame.

My invention consists in certain nove-l features of construction and combinations ot' parts hereinafter described, whereby I reduce friction and add to thestability ofthe caster without increasing the height or weakening its frame, being thus enabled to adapt such casters for use under the heaviest furniture, pianos, iron safes, Src. I further facilitate the manufacture.

In the accompanying drawings, Figure l is a side elevation of a caster. illustrating this invention; Fig. 2, a plan view of the same inverted; Fig. 3, a. vertical section on the line 3 3, Fig. 2; Fig. 4, a sectional plan of the inverted caster in the plane of the line 4 4, Fig. l; Fig. 5, a vertical section ot' another caster, illustrating a modification; Fig. 6, an inverted section on the line 6 6, Fig. 5; and Fig. 7, a vertical section of a third caster, illustrating another modification.

Arepresents the foot of a table-leg or the like, and B C the respective parts ot' a caster constructed according to this invention and attached thereto. The part C comprises an ordinary supporting-wheel, w, its axle a, and

frame j', with a pair of anti-friction wheels or rollers, r r, and their axle pins or journals p 4o p, and is permanently connected with the part B, at the center of the latter, by a pivot, 00

out heads at their outer ends. They are so located belowthe upper edge ot' the caster-frame and top ofthe wheel, with reference. to height, as to support rollers r, votsuch diameter that a track-ange, t, on the bottom of the part B will rest evenly on the tread of' each roller, and the rollers may be flanged at their inner sides, so that by engaging with the inner wall of said track iiange they will be kept on the headless pivot-pins. Toi'urtherinsurethisarearwardlyextended arm, g,ris formed on the framef, at right angles to a line, y, drawn through the two rollers, and serves to keep the frame from tilting and the rollers from dropping clear of said track-ange, aswell as to relieve the pivot w from strain.

The respective pins 19 may be supported by bosses formed on the sides of the roller-frame, and their introduction in no way weakens the latter, while the rollers, being wholly outside of' the frame and belon7 the upper edge, may be ot' any desired diameter up to that of the wheel W withonti-ncreasing the height ofthe caster.

transmitted in substantially a direct vertical line to the center wheel, w, so as to relieve the axial rivet m of strain, and the frame C is adapted to swivel around the latter with freedom to change the direction of the Wheel.

The supporting-plate Bis attached to the foot A by screws y or otherwise, as usual.

In the modifications represented by Figs. 5 and 7 the rollers r r are not flanged, and bear with little friction on the rounded track t. The rollers when thus constructed are supported by pivot-pinsp p, having heads at their outer ends. The radial bosses on the frames f are drilled axially to receive said pins7 and the latter, being tightly fitted to the drill-holes, are driven in and secured by cross-drilling and riveting, as illustrated by Fig. (i. Similar rollers may be used on cast-in pins p by heading the latter.

Having thus described my said invention, I claiml. The combination, in a caster of a bearingplate, aframe pivoted thereto and carrying the caster wheel or wheels, and friction-rollers IOO 4L. The combination of the plate, track t, 15 framej, flanged rollers 0' l', rotating on headless pins, and arm g, whereby the frame is pre- 2. The combination ofthe beaiixigplate,east vented from tilting and the flanged wheels erframe pivoted thereto and carrying rollers from slipping beneath the track, as set forth.

turning on radial axes proieetingtron] the opl on journals projecting from the opposite sides i In testimonywhereof l have signed myname 2o posite sides of the easter-frame below the top ot' the casterwheel, substantially as set forth.

of the frame and below the top ot' the wheel, to this speeiteation in the presence of two suband arranged with their central bearings on seribing witnesses.

the same vertical plane as the center ot' the caster-wheel, as set forth.

3. The combination of the frame, its headless journals p east therein, anged rollers o', and plate, with an annular track, t, substantially as set forth.

SALEM T. LAMB.

Witnesses CoUR'rNEY A. COOPER, H. E. HAUsuANN. 

